as...as if用法

问题描述:

as...as if用法
在句子 “The world is full of very rich peoplo who are miserable as if they were living in hell.”中有一个as...as的格式,我知道它的意思是什么和什么一样,但第2个as后面怎么有个if?

as if:
好像
He was shaking with fright as if he had seen a ghost.
他吓得直哆嗦,就好像看见了鬼一样.